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Cerebral cortex (New York, N.Y. : 1991)
05 01, 2017;27 (5): 3064-3079.

Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation.

Daniel Carey, Marc E Miquel, Bronwen G Evans, Patti Adank, Carolyn McGettigan
Author Information
  1. Daniel Carey: Department of Psychology, Royal Holloway, University of London, London TW20 0EX, UK.
  2. Marc E Miquel: William Harvey Research Institute, Queen Mary, University of London, London EC1M 6BQ, UK.
  3. Bronwen G Evans: Department of Speech, Hearing & Phonetic Sciences, University College London, London WC1E 6BT, UK.
  4. Patti Adank: Department of Speech, Hearing & Phonetic Sciences, University College London, London WC1E 6BT, UK.
  5. Carolyn McGettigan: Department of Psychology, Royal Holloway, University of London, London TW20 0EX, UK.
PMID: 28334401 DOI: 10.1093/cercor/bhx056

Abstract

Imitating speech necessitates the transformation from sensory targets to vocal tract motor output, yet little is known about the representational basis of this process in the human brain. Here, we address this question by using real-time MR imaging (rtMRI) of the vocal tract and functional MRI (fMRI) of the brain in a speech imitation paradigm. Participants trained on imitating a native vowel and a similar nonnative vowel that required lip rounding. Later, participants imitated these vowels and an untrained vowel pair during separate fMRI and rtMRI runs. Univariate fMRI analyses revealed that regions including left inferior frontal gyrus were more active during sensorimotor transformation (ST) and production of nonnative vowels, compared with native vowels; further, ST for nonnative vowels activated somatomotor cortex bilaterally, compared with ST of native vowels. Using test representational similarity analysis (RSA) models constructed from participants' vocal tract images and from stimulus formant distances, we found that RSA searchlight analyses of fMRI data showed either type of model could be represented in somatomotor, temporal, cerebellar, and hippocampal neural activation patterns during ST. We thus provide the first evidence of widespread and robust cortical and subcortical neural representation of vocal tract and/or formant parameters, during prearticulatory ST.

Keywords

FMRI learning. rtMRI sensorimotor transformation speech

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MeSH Term

Adult
Brain Mapping
Female
Humans
Image Processing, Computer-Assisted
Larynx
Lip
Magnetic Resonance Imaging
Male
Oxygen
Palate, Soft
Sensorimotor Cortex
Speech
Speech Acoustics
Tongue
Young Adult

Chemicals

Oxygen
Journal Article Research Support, Non-U.S. Gov't
Article has an altmetric score of 5

Word Cloud

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